It should be enough to select Default theme in themes list. This must restore page layout to initial state. This is the solution for standard workflow.

There is no need to format your hard drive if you want to restore all settings to defaults, you may:
1. Delete priPrinter in the list of your printers.
2. Delete priPrinter files in the My Documents
3. Delete HKEY_CURRENT_USER\Software\Pelikan Software KFT\priPrinter registry key.